/ Dictionary / Index H heptagon: Meaning and Definition of Find definitions for: hep•ta•gon Pronunciation: (hep'tu-gon"), [key] — n. a polygon having seven angles and seven sides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heptagon (Thesaurus) heptad heptagonal Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language